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Why do we copy then move?
... a raw C string, a std::string will be constructed, then copied again: two allocations.
There is the C++03 method of taking a reference to a std::string, then swapping it into a local std::string:
struct S
{
std::string data;
S(std::string& str)
{
std::swap(data, str);
}
};
that...
What are the effects of exceptions on performance in Java?
... way to avoid the "rock and hard place" choice you present here, is to pre-allocate an object that represents "success". Usually one can also pre-allocate objects for the common failure cases. Then only in the rare case of passing back additional detail, is a new object created. (This is the OO equi...
Setting UIButton image results in blue button in iOS 7
...]];
Add an UIImageView to your button.
UIImageView * img = [[UIImageView alloc] initWithImage:[UIImage...]];
[button addSubView:img];
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iPhone: Setting Navigation Bar Title
...ify the last navigation item:
UINavigationItem* item = [[UINavigationItem alloc] initWithTitle:@"title text"];
...
[bar pushNavigationItem:item animated:YES];
[item release];
or
bar.topItem.title = @"title text";
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Changing navigation title programmatically
...vigationItem is also set. Generally, this is better than programmatically allocating and initializing a UINavigationBar that's not linked to anything.
You miss out on some of the benefits and functionality that the UINavigationBar was designed for. Here is a link to the documentation that may help...
How to create a sub array from another array in Java?
...e nulls trailing elements if they are out of source array range instead of allocating a smaller array :(
– Daneel S. Yaitskov
Jun 26 '15 at 14:59
12
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IOS: verify if a point is inside a rect
...is in the UIView instance you are using.
Example:
UIView *aView = [UIView alloc]initWithFrame:CGRectMake(0,0,100,100);
CGPoint aPoint = CGPointMake(5,5);
BOOL isPointInsideView = [aView pointInside:aPoint withEvent:nil];
s...
RabbitMQ and relationship between channel and connection
...these concepts are not tied together.
Each Consumer runs in its own thread allocated from the consumer thread pool. If multiple Consumers are subscribed to the same Queue, the broker uses round-robin to distribute the messages between them equally. See Tutorial two: "Work Queues".
It is also possi...
How to convert List to List?
... @MichaelHornfeck The first ToList should be AsEnumerable, no need to allocate a second List
– Ronan Thibaudau
Jun 12 '19 at 3:56
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What does PermGen actually stand for?
...
"In JDK 7, interned strings are no longer allocated in the permanent generation of the Java heap": oracle.com/technetwork/java/javase/jdk7-relnotes-418459.html
– almalkawi
Dec 20 '13 at 18:41
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